until recently considered a member of the Family Balaenidae. However, they are not right whales at all, and their taxonomy is presently in doubt. Most recent authors place this species into the monotypic Family Neobalaenidae,but a 2012 study suggests that it is instead the last living member of the Family Cetotheriidae, a family previously considered extinct.

Yet another species of right whale was proposed by Emanuel Swedenborg